Safely-controlled sand cutting and screening machine



Feb. 12 1924. 1,483,646 J. s. TQWNSEND SAFELY CONTROLLED SAND CUTTING AND SCREENING MACHINE Filed April 13, 1921 2 Sheets-Sheet, I.

145 mm 46 ,4 I J 47 5 I l 1 5 ffzyyz I fl 54 Z2 i J64? ,6 {a v 45 I $0M?" "Wm 1 MMEW Feb. 12 1924. J. s. TOWNSEND SAFELY CONTROLLED SAND CUTTING AND SCREENING MACHINE 2 Sheets-Sheet 2 Filed April 13. 1921 i272; jibwvzsmd Patented Feb. 12, 192:4.

UNITED STATES PATENT OFFICE.

JOHN S. TOWNSEND, OF HARVEY, ILLINOIS, ASSIGNOR TU -IIHI'ZIZIN G CORPORATION, OF

' HARVEY, ILLINOIS, A CORP O R-A 'IION OF ILLINOIS.

SAFELY-CONTROLLED sAND CUTTING AND SCREENING MACHINE.

To all whom it mm concern:

Be it known that l JonN SJTov'vnsmro, a .citizen of the United States, residing at Harvey, in the county .of (k and btate of Illinois, have invented a certain new and useful Improvement in Safely-Controlled Sand Cutting and Screening Machines, of which the following is-a. specilication.

In the art of'cutting, aerating and remixin used molding sand ona foundry floor t ere are at the pre'sent'time machines carried by three or more wheels adapted to run over the floor, pick u sand on it, elete-it to a riddle carried by the machine -51 and finally deliver it in rows of pre- "pared sand suitabl located on the floor ready for re-use'; uch machines are conventionally equipped with chain and bucket conveyor elevators extending in front in the path of travel of the machine to collect all the sand down to a point very close to the floor and conve it up to the riddle high up in the ma ine. Foundry floors are not as smooth as billiard tables, but are, on the other hand, more or less rough with the result that as the three or rfour wheeled machine travels over the floor, it, because of irre ularity of the floor itself, or' because of sand or pieces of'iron or other obstructions on the floor, is of necessity forced to rock and sway out of a level plane as its different wheels encounter these obstructions. This rocking and swaying of the machine necessarily correspondingly raises and lowers the working end of the elevator from the floor, and it is therefore necessary to provide a convenient and easily operatablc means by which the attendant can vary the ungularity of the elevator with reference to the machine and kee its collecting end or nose as near as possi Is at an even level distance above the floor, thus preventing the nose of the elevator plunging into the floor when the forward end of the machine is depressed and preventing its rising to such a height above the floor that an undesirable quantity of sand is left on the floor when the forward end of the machine is unduly elevated or its opposite end is unduly depressed.

The objects of this invention are to equip such a machine with a readily manipulateble mechanism for constantly. controlling the angular position of the eleva or. to keep Application filed April 18, 1921. Berial F0. 461,182.

its nose at a roper distance from the floor and to provi e a safety release mechanism which will, in case of accident or attendants neglect, automatically disconnect the control mechanism from the source of power of the machine.

The invention consists in means for attaining the fore oing objects which can be easily and cheap y made, which is v eiiicient in operation, and is not readilg liable to get out of order. More particularly-the invention consists in many features and de tails of construction hereafter more fully set forth in the specification and claims.

Specifically the invention is an improvement upon t e complete machine shown in my prior United States application, Serial N 0. 380,714,- filed May 12, 1920 and so much of that machine is shown in these draw' appears necessary to understand the present invention.

Referring to the drawings in which like numerals represent the same parts thruout the several views,

Figure 1 is a side elevationof such a machine having the mechanism of this invcntion applied thereto.

Figure 2 is a plan view of the right hand half of Figure 1 taken on the line 2-2 of that figure, the cutter blades 44 bein in a difi'erent angular position.

Figure 3 is a perspective view of the" special clutch control mechanism which enters largely into this invention.

Figure 4 is a plan view lar'gely insection of the clutch and gearing mechanism.

The, for the purposes of this application, conventional machine shown in t e drawings, includes front wheels 10, rear wheels 12, a general frame 1415l617'1819 and a riddle 20. Pivoted. at. a suitable shaft 22 near the top of the con'iparatively high machine is an elevator frame mechanism 24 carrlyin g a suitably mounted elevator chain mec iamsm 26 equipped with buckets 28 of conventional form adapted as the lower or nose end 30 of the elevator enters the sand 36 to scrape the sand from the floor 38 and carry it up to the riddle 20 for handling by it in the manner well known in the art.

The nose 30 of the elevator is conventionally vator groper: rotatableblades 44 conand from'the body of the machine to cause .the nose end of the elevator to always engage and pick up sand from points as close as possible to the floor 38 without the ironmcn i l-either cutting into the floor or being an inefi'ective distance above the floor,

for the reasons pointedont in the opening" statement that'power mechanism is required 'for the worln Each side of the elevator frame is ro- -vided with a projecti trunnion 46 on w ich is journaled ageneral y horizontal push bar 47 extending inside the main frame oii the machine where it is provided with anciengated slot 48 thru which 9 shaft 50 cartying a pinion 54 mesh: with a rack 56 mounted hpon and earri by. the member 47." When-the shaft 50 is rotated the pin;

@ionsforoe their adjacennr elrs 56 to travel horizontally over the pimone, thus reci rocating the push bars 47 and consequent y theel'evator mechanism; Shaft 50 is selectively rotatable in either direction'thru a preferred form of mechanism entering essentially into this invention. On the end of shaft 50, enclosed within a suitable casing washing with a common bevel gear 64 on a 52,;is a worm ear 55, mesliingivitli a worm 57, rigid on a orizontal shaft 58; Rotatebly mounted on theshaft are a air of bevel gears 60-62 placed facing one: other and shaft 66 supplied with power from any suitable souree as for instance, thru a. sprocket chain 68. Obviously the rotation of shaft 66 and gear 64 causes the gears 60 and 62 to rotate mntinuonsly in opposite directions.

Reeiprocatable along a spline 70 carried hy the shaft58 is a cylindrical clutch member 72-ear ing on opposite ends saw shaped clutche teeth 74 and 75 adapted respectively =toi1nesh' with corresponding clutch teeth 76 the side of gear Wheel 62 and teeth 78 on the side of gear 60. Clutch member 72 isiencloscd and-rotatable within a ring -80 loosely-fitting in notch-82 provided for it in the clutch hndy. Projecting from outside the ring'am pins or studs 84 engaging a yoke member. 86 pivoted :it 88 on a suitw hie stationary point ns for instance frame portion .The upper end of this yoke is conncctedto a rod 92 a'tt'ucl cd lo'the swinging e'ndofn lever .94 carrirl hy shaft. 96 on n'hdse opposite end mrtio'n is an operating lever 98 adapted to e selectively iockedby the indented portion 100 of a spring catch 102: TV'ncn lever'98'is in the notch the collar 80'is held in such a position-that 1 seems neither set of teeth 7-1 or 75 carried'by member 72 is in mesh with the saw teeth on the adjacent bevel gear 60 or 62. Vlhen lever 98 is released from notch 100 and swung u ward toward the free endof the sprin ei 102, teeth it on the left hand end '0 collar 72 are thrown into mesh with teeth 76 on bevel gear 62 with the result that the poweroi that gear is transmitted to the shaft 58 to rotate it in one direction to move the rod 47 and co uentl the elevator in a given direction. hen e lever 98 is released fmmnotch' IOO'and-moved downward as viewedin Fi re 2 the e agement of teeth 75 on the ng with teeth 78 is e acted with the result that ht handend of member 72 the oppositely rotat' gear 60 rotates shaft 58 in the opposite from that previously descri The spring in elip 102 is sufficiently strong so that under ;ordinary conditions it will retain lever 94 in either one of the changed positioned;-

sc'rihed and thus cause the shaft 86 to rotate the elevator.=

The saw she. clutch teeth'74*-75"76 78 are very important because when progerly held thruthe operators' kee ing-hrs hand on lever 98101 by the actioniof men'iber 102 as described, there is suflicient'frictional shaft 58, to swing engagement between onposite inter-meshing teeth to cfl'ect'the drivin opera'tion ded irection, consequently moves the elevator in the oga site direction scribed, yetthe teeth are an ciently angular v to permit them to-aet as cam faces to slip afar-t and thus automatically separate the c utchii! from the adjacent gear shohld the nose 30 of the elevator catch on the' floor or should the operator accidentally allow i voter to swing so farvthatthe' are 54 reach either one of theendspf the s ots 48.

lVere ordinary square clutch teeth used in place of the saw; teeth automatic disengage? ment of the power would be entirely impossible should anything hafipen to the elevator? 1. In mechanism of theclass described, a

wheeied'i'chicle, an elevator mechanism havmg a working nose near the" floor means for moving thenose of the elevator toward and from the floor, poivcr driven mechanism for operating said elevator moving means ands. manually controllable clutch having sanshaped interfitting teeth" interposed between said power driven mechanism and the elevator moving means.

'2. in mechanism of the class GBSQIl-Dfifl ll, wheeled vehicle, anelevator mechanism haviua.

manic-1e between sal' power driven mechanism and om elevator moving means.

3. In mechanism of the class described, a

wheeled vehicle, an elevator mechanism hav ing a Working nose near thefloor, means for movin the nose of the elevator toward and from 1; 1e floor, power driven mechanismior operating said e evator movin means and a manually controllableclutch d1 fitting cam faces, automatically separable under excess load interpos'edtbetween said power driven mechanism and the elevator moving means.

4. In mechanisni of the class described, a wheeled vehicle, an elevator mechanism having a working nose near the floor, means for movin the nose of the elevator toward and from t e floor, power driven mechanism for'opera'ting said "elevator moving means and; a manually controllable reversible clutch having interfitting cam faces, automatically separable under excess load, interposed between said power driven mechanism. and the elevator.

5. Iii mechanism 'of the class described,

an elevator memberhaving one end located near the floor, and the other end pivoted to a point high above the floor, means for transporting 'said elevator inthat position over the floor, means vfor,'moving the elevator backwards and forward in a vertical plane about said pivot, power. driven mechanism for operating said elevator movin means and a manually controllable elntci having saw shaped interfitting teeth interplane posed between said power driven mechanism and the elevator movin means.

6. In mechanismof t c class described, an elevator member having one end located near the floor, and the other end-pivoted to a point. high above the floor, mpans for transporting said elevator in that.position over the floor, means for moving the elevator backwards and forward in a vertical about said pivot,- power driven mechafor operating said elevator moving nism means and a manually controllable reversihle clutch having saw shaped interfitting teeth interposed hetweensaid power driven mechanism and the elevator moving means.

7. In mechanism of the class described, an elevator member having one end located near the floor, and the other end pivoted to a point high above the floor, means for transporting said elevator in that position over the floor. means for moving the elevator backwards and forward in a vertical plane about said pivot, power driven mechanism for operating said elevator moving aving inter-.

ried by another shaft meshin "a vehicle for movement.

means and a manually controllable clutch 'h'avin interfitting cam faces, automatically separa le under excess load, interposed between said power driven mechanism and the elevator moving means.

transporting said elevator in that position over the floor, means for moving the elevator backwards and forward in a vertical plane about said' pivot, power driven mechanism for operating said elevator moving means and a manually controllable reverspoint high up in the machine a source 0 poiver accessible inside the machine, means,

optratively connecting said source of power .ible clutch having intei fitti'ng cam faces,

anism a to be elevated includinga reversing mechanis'm whereby the operator may selectively move the elevator in opposite directions andmenns operatable automatically by excessive strain on the elevator moving means for; disconnecting the power means.

1.0. In mechanism of the class described, a vehicle adapted to travel over a foundry fioor, an elevator mechanism pivoted at one end to a point high up on the vehicle, having its other end adapted to engage the floor on which the vehicle travels, a rod.

pivoted to the elevator intermediate of its lmwth. a rack on said rod, a car meshln i with said rack, a shaft driving said gear, a worm wheel on said shaft, a.'worm carwith the worm wheel, a reciprocatable c utch memher spliced to the last mentioned shaft, saw teeth at angles of 90 on opposite ends of the clutch member, oppositely rotatin" power members concentric with the sha at opposite ends of the clutch member carrying saw teeth meshing with the last mentioned saw teeth, and means under the control of the operator for selectively moving theclutch member into engagement with one or the other of the sets of teeth on the rotating power member.

11. In mechanism of the class described, over a foundry floor, an inclined elevator almost touching at one end on the floor, and pivoted at the other end high up in tlr. machine, a rotat able shaft, means connecting said shaft. in each a manner that as it rotates in opposite directions it rocks the-elevator about said 'pi'rot, a clutch splinedto said shaft, saw

, teeth on opposite ends of said; clutch, p'o'wer driven; rotatable wheels; moving, concentric with said shaft at op "tej-endaf oi clutch.member,, rovid on their faces with saw-teeth inter ttable with-the teeth on he clutph'melnber and means controlled b the operator for selectively moving the '0 utch member into enga ment with one or the other-0f the rotate 1e power members.

- 12. In mechanism of the class described, a swinging elevator member, power mechanism for selectively moving the elevator in opposit efiirectiona, a clutch member for determimng which direction vthe power shall 'move the elevator, a hand slight recess 100 interm 'nism'for'selectively moving t e elevator in opposite directions, a clutch-member for determining which direction the power mechanism shall move the elevator, a hand opermeans for selectivelyv locking said lever in 'neutral position,"said locking means consisting'of level- 102, of sprin metal having a iate of itsv'ends, for the purposes set forth. a l In witness whereof, I have hereunto subscribed my name. V

JOHN s. TOWNSEND.

- ated lever 98 for controlling the clutch, and 

